参数资料
| 型号： | AFE7222IRGCT |
| 厂商： | Texas Instruments |
| 文件页数： | 82/106页 |
| 文件大小： | 0K |
| 描述： | IC AFE 12BIT 65/130MSPS 64VQFN |
| 标准包装： | 1 |
| 位数： | 12 |
| 通道数： | 4 |
| 功率（瓦特）： | 610mW |
| 电压 - 电源，模拟： | 2.85 V ~ 3.6 V |
| 电压 - 电源，数字： | 1.7 V ~ 1.9 V |
| 封装/外壳： | 64-VFQFN 裸露焊盘 |
| 供应商设备封装： | 64-VQFN 裸露焊盘（9x9） |
| 包装： | 标准包装 |
| 其它名称： | 296-30113-6 |
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SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
9.12 TRANSMIT FINE FREQUENCY MIXER (FMIX)
The fine mixer uses a Numerically Controlled Oscillator (NCO) to generate two complementary outputs of
a finely programmable frequency, which is then mixed with the A and B inputs to generate complex
outputs.
The mixer computes two outputs as follows:
Output I = {Acos(
ωmixt) – B sin(ωmixt)} and
Output Q = {Asin(
ωmixt) + Bcos(ωmixt)}
where
ωmix is the programmed fine frequency.
The NCO has a 32 bit frequency register, and a 20 bit phase register. The 32 bit frequency register can be
used to set the mixing frequency over a range of ±Fs/2 in steps of Fs/232.
9.13 TRANSMIT COARSE FREQUENCY MIXER
The transmit path contains an optional ±FDACCLK/4 coarse digital frequency mixer. An example of its use is
the processing of an input pattern to the AFE7225/7222 at or near baseband. The digital mixer can move
the carrier or block of carriers to a higher IF after interpolation. This is useful especially in quadrature
modulation as it creates more separation between the wanted signal and its image, making it easier to
filter the unwanted image at RF after the analog quadrature modulator.
MIXING MODE
MIXING
MIXING PATTERN(1)
Iout = { +A, +A , +A, +A }
00
Normal (Low Pass, No Mixing)
Qout = { +B, +B , +B, +B }
Iout = { +A, –A , +A, –A }
01
High Pass (Fs/2)
Qout = { +B, –B , +B, –B }
Iout = { +A, –B , –A, +B }
10
+Fs/4
Qout = { +B, +A , –B, –A }
Iout = { +A, +B , –A, –B }
11
–Fs/4
Qout = { +B, –A , –B, +A }
(1)
A and B are the inputs to the CMIX block. Iout and Qout are the outputs.
9.14 TRANSMIT INVERSE SINC FILTER
The inverse SINC filter is 9-tap and has a response that is inverse of the natural DAC droop versus
frequency (due to sin(x)/x roll-off caused by zero-order hold of DAC sampling. It uses the same
coefficients as in DAC5688. The inverse sinc filter has a gain > 1 at all frequencies. Therefore, the signal
input to the inverse SINC must be reduced from full scale to prevent saturation in the filter. The amount of
backoff required depends on the signal frequency, and is set such that at the signal frequencies the
combination of the input signal and filter response is less than 1 (0dB). For example, if the signal input to
the inverse SINC filter is at FDACCLK/4, the response of the inverse SINC is 0.9 dB, and the signal must be
backed off from full scale by 0.9 dB. The gain function in the QMC block can be used to reduce the
amplitude of the input signal. The coefficients are same as those in the inverse SINC filter in DAC5688
(listed only up to the middle one).
Coefficients = [ 1 –4 13 –50 592 ]
Its frequency response is shown below:
Copyright 2011–2012, Texas Instruments Incorporated
APPLICATION INFORMATION
77
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| AFE7225EVM | 功能描述:射频开发工具 AFE7225 Eval Mod RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| AFE7225IRGC25 | 功能描述:射频前端 Dual 12B,125MSPS ADC RoHS:否 制造商:Skyworks Solutions, Inc. 类型: 工作频率:2.4 GHz, 5 GHz 最大数据速率:54 Mbps 噪声系数: 工作电源电压:3.3 V 电源电流:180 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-32 |
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